Artificial tooth-crown.



No. 644,803. Patented Mar. 6, I900. H. I). JUST]. ARTIFICIAL TOOTH CROWN.

A lication med o tl e, 1899.)

(No llndal.)

'mzwuams PETERS co, FNOTO-LITNOQWASNINGTOM 11c NlTED STATES PATENT OFFICE.

HENRY D. JUSTI, OF PI-IILADEEPHIA, PENNSYLVANIA.

ARTIFICIAL TOOTH-CROWN.

SPECIFICATION forming part of Letters Patent N 0. 644,803, dated March 6, 1900.

Application filed October 6, 1899. Serlal No- 732,764. (No model.)

To all whom it may concern:

Be it known that I, HENRYD. JUsTI, a citizen of the United States, residing in the city chor and a crown of novel construction, Whereby they may be effectively secured to each other While the anchor permits access to the root Whenthe crown is removed without removing said anchor from its seat insaid root.

Figure 1 represents a perspective view of a fastening for an artificial tooth-crown embodying my invention, the parts being separated. Fig. 2 represents a vertical section thereof on line a: 00, Fig. 4., the parts being connected. Fig. 3 represents a top or plan view of the crown. Fig. 4. represents a horizontal section on line y l Fig. 2. Fig. 5 represents a perspective view of another form of my invention. Fig. 6 represents a perspective View of another part of the invention, and Fig. 7 represents an end view thereof.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates an artificial tooth-cro wn, and B designates a vertical cavity therein. On one of the walls of saidcavity is the vertically-extending tongue 0, which projects inwardly from said wall into said cavity, so as to partially occupy said cavity and is of U or V shape in cross-section.

D designates a pin or anchor, which consists of a piece of suitable metal bent or otherwise produced in channeled or bifurcated form with an open or divided side and having the longitudinally-extending canal E therein, the upper end of said anchor being adapted to enter a natural root and the lower end to enter the cavity B of the crown A, it being noticed that the canal E receives the tongue C, the walls of the divided or open side of the pin engaging said tongue, whereby the anchor is interlocked with the crown through the medium of said tongue, it being further noticed that when cement or filling material is introduced into the cavity B the anchor is firmly and reliably connected with the crown and the latter may be similarly secured to the root.

Owing to the projection of the tongue into the canal E, the latteris prevented from closing or contracting, and thus loosening of the anchor in the'crown is prevented, it being furthermore seen that when the anchor is secured to the rootthe exposedportion orouter end of the anchor may have the crown readily fitted to the same in a convenient manner,

as the tongue and canal act as a guide for properly fitting the crown in said end with the advantages of connecting said parts, as

the holding action of the cement or fillingthereon, said pin being V-shaped, while in the other figures it is U shaped; but to these fea* tures I do not limit myself.

When desired, I insert in the canal or groove E a core, such as G, the same being cementedin said canal, so that in case of a required operation on the root the crown will be removed, when access is had to the core, the latterthen being withdrawn, leaving the canal free for the introduction of an instrument to reach the root.

It is evident that the anchor or pin maybe fused inv the crown, thus firmly connecting the same, the other advantages stated being preserved.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. An anch'or or pin forconnecting an artificial tooth-crown with a natural root consisting of a piece of material having its ends adapted to enter said crown and root and formed with a longitudinally-extending canal and a vertically-extending open side.

2.- An artificial tooth-crown having a cav ity therein, and a member on a wall of said 111;; canal or groove therein for the purpose set forth, and a core removably occupying 10 said canal.

HENRY D. JUSTI.

Witnesses:

JOHN A. WIEDERSHEIM, WM. CANER WIEDERSHEIM. 

